Try to build this 100% yourself.
The PCB is easy, anyone can do.
Getting 8 FETs matched is not so simple, especially when they are SMD.
We already did all the difficult work for you.
Then Fran did the rest, making it almost too easy. (Many thanks Fran.)
The rest is also all there in the public.
I think it is not unfair to ask you to help yourself.